Future Vision: 3D Printers In Electric Cars?

Le FabShop teamed up with electric car manufacturer Renault to give us a glimpse of what the future may look like. According to le FabShop, 'We believe that in a near future, cars will be electric, self-driven & equipped for advanced field operations. Your plumber will be able to produce spare-parts in his vehicle, some goods will be produced on demand in the delivery truck.' What do you think of this idea?